lxc: forbid negative blkio values
lxc: forbid negative blkio values

Partially resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1131306

Signed-off-by: Martin Kletzander <e82f23e74d43760279ebcc505dac4ae70d5627d0@redhat.com>

agx/libvirt,jfehlig/libvirt,jfehlig/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,agx/libvirt,andreabolognani/libvirt,olafhering/libvirt,jardasgit/libvirt,datto/libvirt,rlaager/libvirt,andreabolognani/libvirt,olafhering/libvirt,VenkatDatta/libvirt,agx/libvirt,shugaoye/libvirt,libvirt/libvirt,rlaager/libvirt,taget/libvirt,fabianfreyer/libvirt,rlaager/libvirt,datto/libvirt,agx/libvirt,nertpinx/libvirt,crobinso/libvirt,fabianfreyer/libvirt,datto/libvirt,andreabolognani/libvirt,datto/libvirt,zippy2/libvirt,VenkatDatta/libvirt,eskultety/libvirt,jfehlig/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,taget/libvirt,libvirt/libvirt,elmarco/libvirt,jardasgit/libvirt,taget/libvirt,jardasgit/libvirt,crobinso/libvirt,elmarco/libvirt,VenkatDatta/libvirt,rlaager/libvirt,libvirt/libvirt,eskultety/libvirt,eskultety/libvirt,shugaoye/libvirt,eskultety/libvirt,jardasgit/libvirt,andreabolognani/libvirt,rlaager/libvirt,datto/libvirt,agx/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,shugaoye/libvirt,crobinso/libvirt,olafhering/libvirt,olafhering/libvirt,zippy2/libvirt,elmarco/libvirt,shugaoye/libvirt,zippy2/libvirt,crobinso/libvirt,nertpinx/libvirt,eskultety/libvirt,elmarco/libvirt,nertpinx/libvirt,zippy2/libvirt,elmarco/libvirt,nertpinx/libvirt,taget/libvirt,libvirt/libvirt,fabianfreyer/libvirt,taget/libvirt,shugaoye/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt